@charset "UTF-8";
/*封装*/
.div1 {
  width: 200px;
  height: 200px;
  background-color: aqua;
}

.div1 .div2 {
  width: 100px;
  height: 100px;
  background-color: red;
}

.div1 .div2 .div3 {
  width: 80px;
  height: 80px;
  background-color: blue;
}

.div1 .div2 .div3 .div4 {
  width: 50px;
  height: 50px;
  background-color: green;
  font-size: 200px;
  color: red;
  font-weight: bolder;
}
